fix: prefix /api to avoid rewrite rules in ingress

Author: asaf

main.py

@@ -1,12 +1,13 @@
 import os
 
-from fastapi import FastAPI
+from fastapi import FastAPI, Request
 
 app = FastAPI()
 
 
-@app.get("/")
-def read_root():
+@app.get("/api")
+def read_root(request: Request):
     # list all env vars starting with HELLO-
     hello_env_vars = {k: v for k, v in os.environ.items() if k.startswith("HELLO_")}
-    return {"message": "Hello, World!", "envs": hello_env_vars}
+    headers = dict(request.headers)
+    return {"message": "Hello, World!", "envs": hello_env_vars, "headers": headers}